Discontinued operations - Additional Information (Detail) (USD $)	Sep. 30, 2012	Jul. 31, 2012	Jan. 01, 2012
Accounts receivable		$ 10,100,000
Purchase price for the business segment		33,400,000
Direct costs to sell the business segment		10,000,000
Inventory		29,000,000
Property, plant and equipment	0	11,800,000	12,194,000
Accounts payable and accruals		$ 7,600,000

For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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